CN209659178U - A kind of novel multiplication of voltage-Z-source inverter - Google Patents
A kind of novel multiplication of voltage-Z-source inverter Download PDFInfo
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- CN209659178U CN209659178U CN201920494166.1U CN201920494166U CN209659178U CN 209659178 U CN209659178 U CN 209659178U CN 201920494166 U CN201920494166 U CN 201920494166U CN 209659178 U CN209659178 U CN 209659178U
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Abstract
The utility model belongs to DC-AC contravariant equipment technical field, it is related to a kind of novel multiplication of voltage-Z-source inverter, the Same Name of Ends of first winding is connected with DC power anode, the other end is connected with the anode of the cathode of first capacitor and first diode, the anode of first capacitor is connected with the cathode at the different name end of the second winding and the second diode, the Same Name of Ends of second winding is connected with the cathode of the cathode of first diode and the second capacitor, and the anode of the second capacitor is connected with the cathode of the second diode；Three-phase voltage type bridge inverter main circuit unit is made of six power switch tubes with anti-paralleled diode, for receiving the switching signal of external equipment offer；Overall construction design is reasonable, easy to operate, and the structure that booster circuit and inverter circuit combine reduces the quantity of component, improves the probability density of circuit, reduces production cost and failure rate, is suitable for high gain boost inversion occasion.
Description
Technical field:
The utility model belongs to DC-AC contravariant equipment technical field, and in particular to a kind of novel multiplication of voltage-Z source inversion
Device.
Background technique:
Currently, the aggravation of energy crisis and problem of environmental pollution, has promoted the fast development of renewable energy.Solar energy is made
For one of clean renewable energy, there is sizable development prospect, traditional photovoltaic generating system is by the light of plural serial stage
Volt cell output voltage is exported using DC/AD inverter to power grid, but multistage structure production cost with higher and failure
Rate.On this basis, DC/DC booster converter is added among photovoltaic cell and power grid, first completes boosting, then row inversion, but
The structure of this DC/DC-DC/AC will lead to the problems such as system structure is complicated, working efficiency is low.
Document Peng F Z.Z-Source Inverter [J] .IEEE Transactions on Industry
Application, 2003,39 (2): the Z-source inverter that 504-510 is proposed is as a kind of sigle-stage AC buck inversion electricity
Through connect signal is added in inversion tradition nought state on road, while realizing boosting and grid-connected function, and simple with circuit structure,
Highly-safe advantage.But itself topological structure of Z-source inverter reflects that its boost capability is limited, before obtaining high boosting
Mentioning is to have higher straight-through duty ratio, reduces the modulation factor of inverter in this way, plays reversed adjustment effect, limit it
Application range.Document Qian W, Peng F Z, ChaH. Trans-Z-source inverters [J] .IEEE
Transactions onpower electronics, 2011,26 (12): the source transformer type Z that 3453-3463 is proposed is inverse
Become device (Trans-ZSI) and energy storage inductor is replaced with into coupling inductance, realizes the adjusting of step-up ratio double freedom, and lesser straight
Under logical duty cycle condition, by changing coupling inductance turn ratio, biggish direct-current chain step-up ratio still can get.On this basis,
Inversion modulation factor is also larger, can get higher inverter voltage gain, and still, the high turn ratio of coupling inductance will cause larger
Leakage inductance and the bad parameter such as series resistance, can not only working efficiency be made to reduce, and the energy of leakage inductance release will cause it is big
DC-link voltage peak value, inversion effect is poor, influences circuit working performance.Document Loh P C, Li D, Blaabjerg F. Γ-
Z-source inverters[J].IEEE transactions on Power Electronics,2013,28(11):
The Γ type Z-source inverter (Γ-ZSI) and improve step-up ratio by introducing coupling inductance that 4880-4884 is proposed, and
Trans-ZSI coupling winding construction is similar, and structure locating for coupling inductance module also results in the spike mistake of DC-link voltage
It is high.The unresolved above problem, can be cascaded by multi-level pmultistage circuit, in lesser straight-through duty ratio, be obtained higher
Voltage gain, but the quantity of component in circuit is increased in this way, the complexity of circuit is improved, working efficiency is reduced.
Therefore, find it is a kind of can be obtained under lower straight-through duty ratio higher voltage gain, structure simply, work efficiency is high, inversion
The good inverter circuit of effect has become the research hotspot of this field instantly.
Summary of the invention:
The goal of the invention of the utility model is to overcome disadvantage of the existing technology, designs and provide a kind of novel multiplication of voltage-Z
Source inventer (A Novel Z-source Inverter with Voltage Multiplier Cells (VMC-ZSI)),
Under the conditions of lesser straight-through duty ratio, biggish modulation factor, higher voltage gain is obtained, while topological structure is more simple
Single, work efficiency is high, and failure rate is low, and inversion effect is good.
To achieve the goals above, the main structure of novel multiplication of voltage-Z-source inverter described in the utility model includes direct current
Source, coupling inductance, first capacitor, the second capacitor, the first diode, the second diode being made of the first winding and the second winding
And three-phase inverter bridge circuit unit, the Same Name of Ends of the first winding of coupling inductance are connected with DC power anode, the other end
It is connected with the anode of the cathode of first capacitor and first diode, the different name end of the anode of first capacitor and the second winding and
The anode of two diodes is connected, the Same Name of Ends of the second winding and the cathode of first diode of coupling inductance and bearing for the second capacitor
Extremely it is connected, the anode of the second capacitor is connected with the cathode of the second diode；Three-phase voltage type bridge inverter main circuit unit is by six
The first to the 6th power switch tube composition with anti-paralleled diode, the first to the 6th power switch tube use insulated gate bipolar
Transistor (IGBT) or electric power field effect transistor (MOSFET), one end of the first power switch tube and the 4th power switch
One end of pipe is connected, and tie point draws a phase output terminal of one group of bridge arm as three-phase electricity pressure type bridge type inverter circuit unit；
One end of second power switch tube is connected with one end of the 5th power switch tube, one end of third power switch tube and the 6th power
One end of switching tube is connected, the two tie points draw other two groups of bridge arms as three-phase electricity pressure type bridge type inverter circuit list respectively
Other two phase output terminal of member；The other end of first power switch tube and the second power switch tube, third power switch tube it is another
One end is connected, and is connected to the anode of the second capacitor and the cathode of the second diode, the other end of the 4th power switch tube and the
Five power switch tubes, the other end of the 6th power switch tube are connected, and are connected to the cathode of DC power supply, three-phase voltage type bridge-type
First to the 6th power switch tube of inverter circuit unit receives the switching signal of external equipment offer.
Second winding of coupling inductance described in the utility model and the turn ratio of the first winding are n=N2:N1。
First capacitor described in the utility model and the second capacitor's capacity are equal.
Utility model works state control mode and traditional single stage can all be in inverter circuit as boost inverter circuit
Nought state in through connect signal is added, with the working condition of this circuit, realize the function of boosting.
The utility model compared with prior art, can be in the item of smaller straight-through duty ratio D and biggish modulation factor M
Under part, higher voltage gain is obtained, and no matter circuit work is in which state, is storage between coupling inductance and DC-link voltage
The circuit structure of energy capacitor determines in the course of work when inevitable leakage inductance releases energy, there is the buffering of storage capacitor
Effect, leakage inductance is to DC-link voltage VPNCaused by impact and will weaken significantly, meanwhile, converter overall construction design is reasonable, operation
Simply, the structure that booster circuit and inverter circuit combine reduces the quantity of component, improves the probability density of circuit,
Production cost and failure rate are reduced, high gain boost inversion occasion is suitable for.
Detailed description of the invention:
Fig. 1 is the main body circuit structural schematic diagram of the utility model.
Fig. 2 is the in running order a period of time pass-through state equivalent circuit diagram of the utility model.
Fig. 3 be the utility model it is in running order two when tradition nought state equivalent circuit diagram.
The position Fig. 4 the utility model it is in running order three when non-pass-through state equivalent circuit diagram.
Fig. 5 is the relationship of the gain of the utility model embodiment contrast potential and straight-through duty ratio.
Specific embodiment:
In order to more specifically describe the present invention, below by attached drawing and in conjunction with specific embodiments to the skill of the utility model
Art scheme and working principle are described in detail.
Embodiment:
The main structure for novel multiplication of voltage-Z-source inverter that the present embodiment is related to is as shown in Figure 1, comprising: DC power supply Vg、
By the first winding L1With the second winding L2The coupling inductance of composition, first capacitor C1With the second capacitor C2, first diode D1, second
Diode D2And three-phase inverter bridge circuit unit, wherein the second winding L of coupling inductance2With the first winding L1Turn ratio
For n=N2:N1, in order to more specifically indicate that the model of coupling inductance, Fig. 1 show that the magnetizing inductance of coupling inductance is Lm；Coupling
First winding L of inductance1Same Name of Ends and DC power supply VgAnode is connected, the other end and first capacitor C1Cathode and first
Diode D1Anode be connected, first capacitor C1Anode and the second winding L2Different name end and the second diode D2Positive phase
Even, the second winding L of coupling inductance2Same Name of Ends and first diode D1Cathode and the second capacitor C2Cathode be connected, second
Capacitor C2Anode with the second diode D2Cathode be connected；Three-phase voltage type bridge inverter main circuit unit is by six band inverse parallels
Diode D3~D8The first to the 6th power switch tube S1~S6Composition, the first to the 6th power switch tube S1~S6Using insulation
Grid bipolar transistor (IGBT) or electric power field effect transistor (MOSFET), the first power switch tube S1One end and the 4th
Power switch tube S4One end be connected, tie point draw one group of bridge arm as three-phase electricity pressure type bridge type inverter circuit unit one
Phase output terminal；Second power switch tube S2One end and the 5th power switch tube S5One end be connected, third power switch tube S3's
One end and the 6th power switch tube S6One end be connected, the two tie points draw other two groups of bridge arms as three-phase voltage respectively
Other two phase output terminal of formula bridge type inverter circuit unit；First power switch tube S1The other end and the second power switch tube S2、
Third power switch tube S3The other end be connected, and be connected to the second capacitor C2Anode and the second diode D2Cathode, the 4th
Power switch tube S4The other end and the 5th power switch tube S5, the 6th power switch tube S6The other end be connected, and be connected to straight
Galvanic electricity source VgCathode, the first to the 6th power switch tube S of three-phase voltage type bridge inverter main circuit unit1~S6Receive outer
The switching signal that portion's equipment provides.
Novel multiplication of voltage-Z-source inverter that the present embodiment is related to can be in smaller straight-through duty ratio D and biggish modulation factor
Under conditions of M, higher voltage gain is obtained, there are three types of working conditions for the inverter:
Working condition one is as shown in Fig. 2, three-phase voltage type bridge inverter main circuit unit is in the energy conversion of pass-through state
Mode is converted, first capacitor C from non-pass-through state to pass-through state1With the second capacitor C2After charging, pass through three-phase voltage
The straight circuit of type bridge inverter main circuit unit is discharged, and with DC power supply VgThe excitation winding L of coupling inductance is given togethermCharging,
The second winding L is transferred energy to by the coupled relation of coupling inductance2, first diode D1With the second diode D2Shutdown, this
When meet: vL1+VC1-vL2+VC2-Vg=0, VC1=VC2, vL2=nvL1。
Working condition two as shown in figure 3, three-phase voltage type bridge inverter main circuit unit is in traditional inversion nought state mode,
Direct current chain circuit and AC load do not have energetic interaction, the second winding L at this time2For first capacitor C1, the second capacitor C2Charging, this
When meet: vL2-VC1=0, vL2=nvL1。
Working condition three is as shown in figure 4, the energy that three-phase voltage type bridge inverter main circuit unit is in non-pass-through state turns
Mold changing formula, first diode D1With the second diode D2Conducting, the magnetizing inductance L of coupling inductancemElectric discharge and DC power supply VgOne
It rises and passes through first diode D1With the second diode D2Give first capacitor C1, the second capacitor C2Charging, and pass through three-phase voltage type
Bridge inverter main circuit provides energy for load, meets at this time: Vg-vL1-vL2-VPN=0, vL2=nvL1,vL2=VC1=VC2。
The present embodiment utilizes the voltage-second balance rule of inductance, obtains DC-link voltage VPN=(1-n) Vg/(1-n-D-nD)
=BVg, B is DC-link voltage gain, as can be seen that novel multiplication of voltage-Z source inventer is realizing the boosting of direct-current chain height from formula
While, eliminate the limitation of straight-through duty ratio D and modulation factor.
The present embodiment direct-current chain step-up ratio is compared with Γ-ZSI, Trans-ZSI, voltage gain correlation curve such as Fig. 5
It is shown, it can be seen from the figure that under conditions of identical turn ratio n and duty ratio D, the direct-current chain boost capability of VMC-ZSI
It is better than Γ-ZSI and Trans-ZSI.When direct-current chain step-up ratio is identical with turn ratio, VMC-ZSI is compared with Γ-ZSI and Trans-
ZSI then needs smaller straight-through duty ratio, it can obtains bigger modulation factor, big modulation factor can not only improve inversion
The peak value of device output voltage, moreover it is possible to which the harmonic wave for reducing output voltage influences.
Above-mentioned analysis is it can be shown that the present embodiment can be in the item of smaller straight-through duty ratio D and biggish modulation factor M
Under part, higher voltage gain is obtained, and no matter circuit work is in which state, is storage between coupling inductance and DC-link voltage
The circuit structure of energy capacitor determines in the course of work when inevitable leakage inductance releases energy, there is the buffering of storage capacitor
Effect, leakage inductance is to DC-link voltage VPNCaused by impact and will weaken significantly.Meanwhile converter overall construction design is reasonable, operation
Simply, the structure that booster circuit and inverter circuit combine reduces the quantity of component, improves the probability density of circuit,
Production cost and failure rate are reduced, high gain boost inversion occasion is suitable for.
The present embodiment is confirmed that indices parameter meets the requirement of purpose of design in practical application, is reached
Expected invention effect, and reversals are safe and reliable, overall operation is stablized.
Claims (1)
1. a kind of novel multiplication of voltage-Z-source inverter, it is characterised in that main structure includes DC power supply, by the first winding and second
Coupling inductance, first capacitor, the second capacitor, first diode, the second diode and the three-phase bridge type inverse electricity of winding composition
The Same Name of Ends of road unit, the first winding of coupling inductance is connected with DC power anode, the cathode of the other end and first capacitor with
And the anode of first diode is connected, the different name end of the anode of first capacitor and the second winding and the cathode phase of the second diode
Even, the Same Name of Ends of the second winding of coupling inductance is connected with the cathode of the cathode of first diode and the second capacitor, the second capacitor
Anode be connected with the cathode of the second diode, first capacitor and the second capacitor's capacity；Three-phase voltage type bridge inverter main circuit list
Member is made of six the first to the 6th power switch tubes with anti-paralleled diode, and the first to the 6th power switch tube is using insulation
Grid bipolar transistor or electric power field effect transistor, one end of one end of the first power switch tube and the 4th power switch tube
It is connected, tie point draws a phase output terminal of one group of bridge arm as three-phase electricity pressure type bridge type inverter circuit unit；Second power
One end of switching tube is connected with one end of the 5th power switch tube, one end of third power switch tube and the 6th power switch tube
One end is connected, in addition the two tie points draw other two groups of bridge arms as three-phase electricity pressure type bridge type inverter circuit unit respectively
Two phase output terminals；The other end of first power switch tube and the other end of the second power switch tube, third power switch tube are connected,
And it is connected to the anode of the second capacitor and the cathode of the second diode, the other end and the 5th power switch of the 4th power switch tube
Pipe, the other end of the 6th power switch tube are connected, and are connected to the cathode of DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920494166.1U CN209659178U (en) | 2019-04-12 | 2019-04-12 | A kind of novel multiplication of voltage-Z-source inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920494166.1U CN209659178U (en) | 2019-04-12 | 2019-04-12 | A kind of novel multiplication of voltage-Z-source inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165915A (en) * | 2019-04-12 | 2019-08-23 | 青岛理工大学 | A kind of novel multiplication of voltage-Z-source inverter |
| WO2023045416A1 (en) * | 2021-09-23 | 2023-03-30 | 上海海事大学 | Buck-boost inverter and control method therefor |
| CN117614267A (en) * | 2023-11-20 | 2024-02-27 | 东北电力大学 | Gamma source coupling inductance double-switch direct-current boost network converter and control method thereof |
-
2019
- 2019-04-12 CN CN201920494166.1U patent/CN209659178U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165915A (en) * | 2019-04-12 | 2019-08-23 | 青岛理工大学 | A kind of novel multiplication of voltage-Z-source inverter |
| CN110165915B (en) * | 2019-04-12 | 2024-01-12 | 南京信息工程大学 | Novel voltage-multiplying-Z source inverter |
| WO2023045416A1 (en) * | 2021-09-23 | 2023-03-30 | 上海海事大学 | Buck-boost inverter and control method therefor |
| CN117614267A (en) * | 2023-11-20 | 2024-02-27 | 东北电力大学 | Gamma source coupling inductance double-switch direct-current boost network converter and control method thereof |
| CN117614267B (en) * | 2023-11-20 | 2024-05-17 | 东北电力大学 | Gamma source coupling inductance double-switch direct-current boost network converter and control method thereof |
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